<!DOCTYPE html>
<html>
<head><meta name="generator" content="Hexo 3.9.0">
    

    

    



    <meta charset="utf-8">
    
    
    
    
    <title>Spring MVC之拦截器 | 欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~ | It&#39;s founded on March 9, 2019 and the open source address for the blog notes https://github.com/YUbuntu0109/YUbuntu0109.github.io</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    
    <meta name="theme-color" content="#3F51B5">
    
    
    <meta name="keywords" content="Spring MVC">
    <meta name="description" content="学习笔记 : Spring MVC之拦截器简介 : Spring MVC中的拦截器(Interceptor)类似于Servlet中的过滤器(Filter),主要用于拦截用户请求并做相应的处理,例如通过拦截器可以进行权限验证,记录请求信息的日志,判断用户是否登录等..要使用Spring MVC中的拦截器,就需要对拦截器类进行定义和配置,通常拦截器类可以通过两种方式来定义,如下所示 :  实现Hand">
<meta name="keywords" content="Spring MVC">
<meta property="og:type" content="article">
<meta property="og:title" content="Spring MVC之拦截器">
<meta property="og:url" content="https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/index.html">
<meta property="og:site_name" content="欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~">
<meta property="og:description" content="学习笔记 : Spring MVC之拦截器简介 : Spring MVC中的拦截器(Interceptor)类似于Servlet中的过滤器(Filter),主要用于拦截用户请求并做相应的处理,例如通过拦截器可以进行权限验证,记录请求信息的日志,判断用户是否登录等..要使用Spring MVC中的拦截器,就需要对拦截器类进行定义和配置,通常拦截器类可以通过两种方式来定义,如下所示 :  实现Hand">
<meta property="og:locale" content="en">
<meta property="og:image" content="https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/SpringMVC_Filter-login.PNG">
<meta property="og:image" content="https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/SpringMVC_Filter-main.PNG">
<meta property="og:updated_time" content="2020-03-31T12:36:02.561Z">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="Spring MVC之拦截器">
<meta name="twitter:description" content="学习笔记 : Spring MVC之拦截器简介 : Spring MVC中的拦截器(Interceptor)类似于Servlet中的过滤器(Filter),主要用于拦截用户请求并做相应的处理,例如通过拦截器可以进行权限验证,记录请求信息的日志,判断用户是否登录等..要使用Spring MVC中的拦截器,就需要对拦截器类进行定义和配置,通常拦截器类可以通过两种方式来定义,如下所示 :  实现Hand">
<meta name="twitter:image" content="https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/SpringMVC_Filter-login.PNG">
    
        <link rel="alternate" type="application/atom+xml" title="欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~" href="/atom.xml">
    
    <link rel="shortcut icon" href="/favicon.ico">
    <link rel="stylesheet" href="//unpkg.com/hexo-theme-material-indigo@latest/css/style.css">
    <script>window.lazyScripts=[]</script>

    <!-- custom head -->
    

</head>

<body>
    <div id="loading" class="active"></div>

    <aside id="menu" class="hide" >
  <div class="inner flex-row-vertical">
    <a href="javascript:;" class="header-icon waves-effect waves-circle waves-light" id="menu-off">
        <i class="icon icon-lg icon-close"></i>
    </a>
    <div class="brand-wrap" style="background-image:url(/img/brand.jpg)">
      <div class="brand">
        <a href="/" class="avatar waves-effect waves-circle waves-light">
          <img src="/img/my-portrait.jpg">
        </a>
        <hgroup class="introduce">
          <h5 class="nickname">黄宇辉</h5>
          <a href="mailto:3083968068@qq.com" title="3083968068@qq.com" class="mail">3083968068@qq.com</a>
        </hgroup>
      </div>
    </div>
    <div class="scroll-wrap flex-col">
      <ul class="nav">
        
            <li class="waves-block waves-effect">
              <a href="/"  >
                <i class="icon icon-lg icon-home"></i>
                Homepage
              </a>
            </li>
        
            <li class="waves-block waves-effect">
              <a href="/archives"  >
                <i class="icon icon-lg icon-archives"></i>
                Archives
              </a>
            </li>
        
            <li class="waves-block waves-effect">
              <a href="/tags"  >
                <i class="icon icon-lg icon-tags"></i>
                Tags
              </a>
            </li>
        
            <li class="waves-block waves-effect">
              <a href="/categories"  >
                <i class="icon icon-lg icon-th-list"></i>
                Categories
              </a>
            </li>
        
            <li class="waves-block waves-effect">
              <a href="https://github.com/YUbuntu0109" target="_blank" >
                <i class="icon icon-lg icon-github"></i>
                Github
              </a>
            </li>
        
            <li class="waves-block waves-effect">
              <a href="https://space.bilibili.com/364361791" target="_blank" >
                <i class="icon icon-lg icon-link"></i>
                Bilibili
              </a>
            </li>
        
      </ul>
    </div>
  </div>
</aside>

    <main id="main">
        <header class="top-header" id="header">
    <div class="flex-row">
        <a href="javascript:;" class="header-icon waves-effect waves-circle waves-light on" id="menu-toggle">
          <i class="icon icon-lg icon-navicon"></i>
        </a>
        <div class="flex-col header-title ellipsis">Spring MVC之拦截器</div>
        
        <div class="search-wrap" id="search-wrap">
            <a href="javascript:;" class="header-icon waves-effect waves-circle waves-light" id="back">
                <i class="icon icon-lg icon-chevron-left"></i>
            </a>
            <input type="text" id="key" class="search-input" autocomplete="off" placeholder="Search">
            <a href="javascript:;" class="header-icon waves-effect waves-circle waves-light" id="search">
                <i class="icon icon-lg icon-search"></i>
            </a>
        </div>
        
        
        <a href="javascript:;" class="header-icon waves-effect waves-circle waves-light" id="menuShare">
            <i class="icon icon-lg icon-share-alt"></i>
        </a>
        
        <!-- add the background music on Mar 11,2019
        <div>
            <iframe frameborder="no" border="0" marginwidth="0" marginheight="0" width=280 height=52 src="//music.163.com/outchain/player?type=2&id=438801642&auto=1&height=32"></iframe>
        </div>
        -->
    </div>
</header>
<header class="content-header post-header">

    <div class="container fade-scale">
        <h1 class="title">Spring MVC之拦截器</h1>
        <h5 class="subtitle">
            
                <time datetime="2019-05-23T22:05:26.000Z" itemprop="datePublished" class="page-time">
  2019-05-23
</time>


            
        </h5>
    </div>

    


</header>


<div class="container body-wrap">
    
    <aside class="post-widget">
        <nav class="post-toc-wrap post-toc-shrink" id="post-toc">
            <h4>TOC</h4>
            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-Spring-MVC之拦截器"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 : Spring MVC之拦截器</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#拦截器的执行流程"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">拦截器的执行流程</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#单个拦截器的执行流程"><span class="post-toc-number">1.1.1.</span> <span class="post-toc-text">单个拦截器的执行流程</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#多个拦截器的执行流程"><span class="post-toc-number">1.1.2.</span> <span class="post-toc-text">多个拦截器的执行流程</span></a></li></ol></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#应用案例"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">应用案例</span></a></li></ol></li></ol>
        </nav>
    </aside>


<article id="post-Spring-MVC之拦截器"
  class="post-article article-type-post fade" itemprop="blogPost">

    <div class="post-card">
        <h1 class="post-card-title">Spring MVC之拦截器</h1>
        <div class="post-meta">
            <time class="post-time" title="2019-05-23 22:05:26" datetime="2019-05-23T22:05:26.000Z"  itemprop="datePublished">2019-05-23</time>

            


            

        </div>
        <div class="post-content" id="post-content" itemprop="postContent">
            <h2 id="学习笔记-Spring-MVC之拦截器"><a href="#学习笔记-Spring-MVC之拦截器" class="headerlink" title="学习笔记 : Spring MVC之拦截器"></a>学习笔记 : Spring MVC之拦截器</h2><p><em>简介 : Spring MVC中的拦截器(<code>Interceptor</code>)类似于Servlet中的过滤器(<code>Filter</code>),主要用于拦截用户请求并做相应的处理,例如通过拦截器可以进行权限验证,记录请求信息的日志,判断用户是否登录等..要使用Spring MVC中的拦截器,就需要对拦截器类进行定义和配置,通常拦截器类可以通过两种方式来定义,如下所示 :</em></p>
<ol>
<li>实现<code>HandlerInterceptor</code>接口,或继承HandlerInterceptor接口的实现类,如<code>HandlerInterceptorAdapter</code>.</li>
<li>实现<code>WebRequestInterceptor</code>接口,或继承WebRequestInterceptor接口的实现类.</li>
</ol>
<h3 id="拦截器的执行流程"><a href="#拦截器的执行流程" class="headerlink" title="拦截器的执行流程"></a>拦截器的执行流程</h3><h4 id="单个拦截器的执行流程"><a href="#单个拦截器的执行流程" class="headerlink" title="单个拦截器的执行流程"></a>单个拦截器的执行流程</h4><ol>
<li><p><em>web.xml</em></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">web-app</span> <span class="attr">xmlns:xsi</span>=<span class="string">"http://www.w3.org/2001/XMLSchema-instance"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xmlns</span>=<span class="string">"http://xmlns.jcp.org/xml/ns/javaee"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xsi:schemaLocation</span>=<span class="string">"http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">id</span>=<span class="string">"WebApp_ID"</span> <span class="attr">version</span>=<span class="string">"4.0"</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">display-name</span>&gt;</span>springmvc_filter<span class="tag">&lt;/<span class="name">display-name</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">welcome-file-list</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">welcome-file</span>&gt;</span>index.jsp<span class="tag">&lt;/<span class="name">welcome-file</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">welcome-file-list</span>&gt;</span></span><br><span class="line"></span><br><span class="line">	<span class="tag">&lt;<span class="name">servlet</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 设置前端过滤器 --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">servlet-name</span>&gt;</span>spring_mvc<span class="tag">&lt;/<span class="name">servlet-name</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">servlet-class</span>&gt;</span>org.springframework.web.servlet.DispatcherServlet<span class="tag">&lt;/<span class="name">servlet-class</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 初始化时加载配置文件 --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">init-param</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">param-name</span>&gt;</span>contextConfigLocation<span class="tag">&lt;/<span class="name">param-name</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">param-value</span>&gt;</span>classpath:springmvc-config.xml<span class="tag">&lt;/<span class="name">param-value</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;/<span class="name">init-param</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 容器启动时立即加载Servlet --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">load-on-startup</span>&gt;</span>1<span class="tag">&lt;/<span class="name">load-on-startup</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">servlet</span>&gt;</span></span><br><span class="line"></span><br><span class="line">	<span class="tag">&lt;<span class="name">servlet-mapping</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">servlet-name</span>&gt;</span>spring_mvc<span class="tag">&lt;/<span class="name">servlet-name</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">url-pattern</span>&gt;</span>/<span class="tag">&lt;/<span class="name">url-pattern</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">servlet-mapping</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">web-app</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>CustomInterceptor.java : 自定义拦截器</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.springmvc.filter.interceptor;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletRequest;</span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletResponse;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.web.servlet.HandlerInterceptor;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.servlet.ModelAndView;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: CustomInterceptor</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 拦截器</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 23, 2019 9:23:19 PM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CustomInterceptor</span> <span class="keyword">implements</span> <span class="title">HandlerInterceptor</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">preHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"------ this is preHandle1 ------"</span>);</span><br><span class="line">		<span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">postHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler,</span></span></span><br><span class="line"><span class="function"><span class="params">			ModelAndView modelAndView)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"------ this is postHandle1 ------"</span>);</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterCompletion</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"------ this is afterCompletion1 ------"</span>);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>springmvc-config.xml : Spring MVC配置文件</em></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">beans</span> <span class="attr">xmlns</span>=<span class="string">"http://www.springframework.org/schema/beans"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xmlns:xsi</span>=<span class="string">"http://www.w3.org/2001/XMLSchema-instance"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xmlns:context</span>=<span class="string">"http://www.springframework.org/schema/context"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xmlns:mvc</span>=<span class="string">"http://www.springframework.org/schema/mvc"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xsi:schemaLocation</span>=<span class="string">"http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd</span></span></span><br><span class="line"><span class="tag"><span class="string">		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd</span></span></span><br><span class="line"><span class="tag"><span class="string">		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!-- 指定需要扫描的包 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">context:component-scan</span> <span class="attr">base-package</span>=<span class="string">"pers.huangyuhui.springmvc.filter.controller"</span> /&gt;</span></span><br><span class="line"></span><br><span class="line">	<span class="comment">&lt;!-- 定义视图解析器 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">"viewResolver"</span> <span class="attr">class</span>=<span class="string">"org.springframework.web.servlet.view.InternalResourceViewResolver"</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 设置前缀 --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"prefix"</span> <span class="attr">value</span>=<span class="string">"/WEB-INF/view/"</span> /&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 设置后缀 --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"suffix"</span> <span class="attr">value</span>=<span class="string">".jsp"</span> /&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line">	</span><br><span class="line">	<span class="comment">&lt;!-- 配置拦截器 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">mvc:interceptors</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 拦截所有请求 --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">bean</span> <span class="attr">class</span>=<span class="string">"pers.huangyuhui.springmvc.filter.interceptor.CustomInterceptor"</span> /&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">mvc:interceptors</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">beans</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>MyController.java : 控制器</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.springmvc.filter.controller;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Controller;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.RequestMapping;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: MyController</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 控制器</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 23, 2019 9:20:31 PM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Controller</span></span><br><span class="line"><span class="meta">@RequestMapping</span>(<span class="string">"/myFilter"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyController</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="comment">/**</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Title</span>: singleFilter</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Description</span>: 测试单个拦截器的执行流程</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@return</span>: String</span></span><br><span class="line"><span class="comment">	 */</span></span><br><span class="line">	<span class="meta">@RequestMapping</span>(<span class="string">"/singleFilter"</span>)</span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">singleFilter</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">		System.out.println(<span class="string">"test my filter ~"</span>);</span><br><span class="line">		<span class="keyword">return</span> <span class="string">"index"</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>新建<code>WebContent/WEB-INF/view/index.jsp</code>(仅测试)</em></p>
</li>
<li><p><em>将项目发布到Tomcat服务器并启动,在浏览器中访问地址: <code>http://localhost:8080/springmvc_filter/myFilter/singleFilter</code> 即可得到程序运行结果,如下所示 :</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">------ this is preHandle1 ------</span><br><span class="line">test my filter ~</span><br><span class="line">------ this is postHandle1 ------</span><br><span class="line">------ this is afterCompletion1 ------</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h4 id="多个拦截器的执行流程"><a href="#多个拦截器的执行流程" class="headerlink" title="多个拦截器的执行流程"></a>多个拦截器的执行流程</h4><ol>
<li><p><em>web.xml(同上..)</em></p>
</li>
<li><p><em>CustomInterceptor.java : 第一个自定义拦截器</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.springmvc.filter.interceptor;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletRequest;</span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletResponse;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.web.servlet.HandlerInterceptor;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.servlet.ModelAndView;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: CustomInterceptor</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 自定义拦截器</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 23, 2019 9:23:19 PM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CustomInterceptor</span> <span class="keyword">implements</span> <span class="title">HandlerInterceptor</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">preHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"------ this is preHandle1 ------"</span>);</span><br><span class="line">		<span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">postHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler,</span></span></span><br><span class="line"><span class="function"><span class="params">			ModelAndView modelAndView)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"------ this is postHandle1 ------"</span>);</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterCompletion</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"------ this is afterCompletion1 ------"</span>);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>CustomInterceptor2.java : 第二个自定义拦截器</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.springmvc.filter.interceptor;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletRequest;</span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletResponse;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.web.servlet.HandlerInterceptor;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.servlet.ModelAndView;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: CustomInterceptor2</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 自定义拦截器</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 29, 2019 3:46:30 PM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CustomInterceptor2</span> <span class="keyword">implements</span> <span class="title">HandlerInterceptor</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">preHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"------ this is preHandle2 ------"</span>);</span><br><span class="line">		<span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">postHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler,</span></span></span><br><span class="line"><span class="function"><span class="params">			ModelAndView modelAndView)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"------ this is postHandle2 ------"</span>);</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterCompletion</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"------ this is afterCompletion2------"</span>);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>springmvc-config.xml : Spring MVC配置文件</em></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">beans</span> <span class="attr">xmlns</span>=<span class="string">"http://www.springframework.org/schema/beans"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xmlns:xsi</span>=<span class="string">"http://www.w3.org/2001/XMLSchema-instance"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xmlns:context</span>=<span class="string">"http://www.springframework.org/schema/context"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xmlns:mvc</span>=<span class="string">"http://www.springframework.org/schema/mvc"</span></span></span><br><span class="line"><span class="tag">	<span class="attr">xsi:schemaLocation</span>=<span class="string">"http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd</span></span></span><br><span class="line"><span class="tag"><span class="string">		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd</span></span></span><br><span class="line"><span class="tag"><span class="string">		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!-- 指定需要扫描的包 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">context:component-scan</span> <span class="attr">base-package</span>=<span class="string">"pers.huangyuhui.springmvc.filter.controller"</span> /&gt;</span></span><br><span class="line"></span><br><span class="line">	<span class="comment">&lt;!-- 定义视图解析器 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">"viewResolver"</span> <span class="attr">class</span>=<span class="string">"org.springframework.web.servlet.view.InternalResourceViewResolver"</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 设置前缀 --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"prefix"</span> <span class="attr">value</span>=<span class="string">"/WEB-INF/view/"</span> /&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 设置后缀 --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"suffix"</span> <span class="attr">value</span>=<span class="string">".jsp"</span> /&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line"></span><br><span class="line">	<span class="comment">&lt;!-- 配置拦截器1 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">mvc:interceptors</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">mvc:interceptor</span>&gt;</span></span><br><span class="line">			<span class="comment">&lt;!--拦截所有路径下的请求  --&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">mvc:mapping</span> <span class="attr">path</span>=<span class="string">"/**"</span>/&gt;</span></span><br><span class="line">			<span class="comment">&lt;!-- 拦截指定路径的请求 --&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">bean</span> <span class="attr">class</span>=<span class="string">"pers.huangyuhui.springmvc.filter.interceptor.CustomInterceptor"</span> /&gt;</span></span><br><span class="line">		<span class="tag">&lt;/<span class="name">mvc:interceptor</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">mvc:interceptors</span>&gt;</span></span><br><span class="line">	</span><br><span class="line">	<span class="comment">&lt;!-- 配置拦截器2 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">mvc:interceptors</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">mvc:interceptor</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">mvc:mapping</span> <span class="attr">path</span>=<span class="string">"/**"</span>/&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">bean</span> <span class="attr">class</span>=<span class="string">"pers.huangyuhui.springmvc.filter.interceptor.CustomInterceptor2"</span> /&gt;</span></span><br><span class="line">		<span class="tag">&lt;/<span class="name">mvc:interceptor</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">mvc:interceptors</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">beans</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>MyController.java : 控制器</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.springmvc.filter.controller;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Controller;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.RequestMapping;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: MyController</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 控制器</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 23, 2019 9:20:31 PM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Controller</span></span><br><span class="line"><span class="meta">@RequestMapping</span>(<span class="string">"/myFilter"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyController</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="comment">/**</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Title</span>: doubleFilter</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Description</span>: 测试多个拦截器的执行流程</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@return</span>: String</span></span><br><span class="line"><span class="comment">	 */</span></span><br><span class="line">	<span class="meta">@RequestMapping</span>(<span class="string">"/doubleFilter"</span>)</span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">doubleFilter</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"test my filter ~"</span>);</span><br><span class="line">		<span class="keyword">return</span> <span class="string">"index"</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>新建<code>WebContent/WEB-INF/view/index.jsp</code>(仅测试)</em></p>
</li>
<li><p><em>将项目发布到Tomcat服务器并启动,在浏览器中访问地址: <code>http://localhost:8080/springmvc_filter/myFilter/doubleFilter</code> 即可得到程序运行结果,如下所示 :</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">------ this is preHandle1 ------</span><br><span class="line">------ this is preHandle2 ------</span><br><span class="line">test my filter ~</span><br><span class="line">------ this is postHandle2 ------</span><br><span class="line">------ this is postHandle1 ------</span><br><span class="line">------ this is afterCompletion2------</span><br><span class="line">------ this is afterCompletion1 ------</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h3 id="应用案例"><a href="#应用案例" class="headerlink" title="应用案例"></a>应用案例</h3><p><em>简介 : 通过拦截器来完成一个用户登录权限验证案例.在本案例中,要求如下 :</em></p>
<ul>
<li><em>只有登录后的用户才能访问系统主页面,如果没有登录系统而直接访问主页面,则其请求会被拦截器所拦截,并转发到登录页面,同时在登录页面提出提示信息.</em></li>
<li><em>如果用户名或密码错误,会在登录页面给出相应的提示信息.</em> </li>
<li><em>当已登录的用户在系统主页中单击”退出”按钮时,系统将会退回到登录页面.</em></li>
</ul>
<ol>
<li><p><em>web.xml : 略..</em></p>
</li>
<li><p><em>User.java : 用户信息</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.springmvc.filter.bean;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: User</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 用户信息</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 24, 2019 8:43:49 AM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> Integer id;</span><br><span class="line">	<span class="keyword">private</span> String name;</span><br><span class="line">	<span class="keyword">private</span> String password;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> Integer <span class="title">getId</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> id;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setId</span><span class="params">(Integer id)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.id = id;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> name;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.name = name;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getPassword</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> password;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setPassword</span><span class="params">(String password)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.password = password;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>login.jsp : 用户登录页面</em></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">language</span>=<span class="string">"java"</span> <span class="attr">contentType</span>=<span class="string">"text/html; charset=UTF-8"</span> <span class="attr">pageEncoding</span>=<span class="string">"UTF-8"</span>%&gt;</span></span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">title</span>&gt;</span>应用案例-实现用户登录权限验证<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">h2</span> <span class="attr">align</span>=<span class="string">"center"</span>&gt;</span>用户登录页面  ($&#123;msg &#125;)<span class="tag">&lt;/<span class="name">h2</span>&gt;</span><span class="tag">&lt;<span class="name">hr</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">div</span> <span class="attr">align</span>=<span class="string">"center"</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">"$&#123;pageContext.request.contextPath &#125;/login"</span> <span class="attr">method</span>=<span class="string">"post"</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">table</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">td</span>&gt;</span>用户名<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"name"</span>/&gt;</span><span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">tr</span> <span class="attr">height</span>=<span class="string">"50px"</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">td</span>&gt;</span>密码<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"password"</span> <span class="attr">name</span>=<span class="string">"password"</span>/&gt;</span><span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;/<span class="name">table</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">div</span> <span class="attr">align</span>=<span class="string">"center"</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">input</span> <span class="attr">style</span>=<span class="string">"margin-left:33px"</span> <span class="attr">type</span>=<span class="string">"submit"</span>  <span class="attr">value</span>=<span class="string">"登录"</span>/&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"reset"</span>  <span class="attr">value</span>=<span class="string">"重置"</span>/&gt;</span></span><br><span class="line">			<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>main.jsp : 系统主页面</em></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">language</span>=<span class="string">"java"</span> <span class="attr">contentType</span>=<span class="string">"text/html; charset=UTF-8"</span> <span class="attr">pageEncoding</span>=<span class="string">"UTF-8"</span>%&gt;</span></span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">title</span>&gt;</span>应用案例-实现用户登录权限验证<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">h2</span> <span class="attr">align</span>=<span class="string">"center"</span>&gt;</span>用户主页面<span class="tag">&lt;/<span class="name">h2</span>&gt;</span><span class="tag">&lt;<span class="name">hr</span>/&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">table</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">td</span>&gt;</span>当前用户 $&#123;USER_SESSION.name &#125;<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"$&#123;pageContext.request.contextPath &#125;/logout"</span>&gt;</span>退出<span class="tag">&lt;/<span class="name">a</span>&gt;</span><span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">table</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>UserController.java : 控制器</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.springmvc.filter.controller;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpSession;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Controller;</span><br><span class="line"><span class="keyword">import</span> org.springframework.ui.Model;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.GetMapping;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.PostMapping;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.RequestMapping;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> pers.huangyuhui.springmvc.filter.bean.User;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: UserController</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 控制器</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 24, 2019 8:45:24 AM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Controller</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserController</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="comment">/**</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Title</span>: toLogin</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Description</span>: 跳转到用户登录页面</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@param</span>: null</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@return</span>: String</span></span><br><span class="line"><span class="comment">	 */</span></span><br><span class="line">	<span class="comment">// @RequestMapping(value = "/login", method = RequestMethod.GET)</span></span><br><span class="line">	<span class="meta">@GetMapping</span>(value = <span class="string">"/login"</span>) <span class="comment">// 组合注解</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">toLogin</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> <span class="string">"login"</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">/**</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Title</span>: login</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Description</span>: 用户登录</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@param</span>: user</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@param</span>: model</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@param</span>: session</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@return</span>: String</span></span><br><span class="line"><span class="comment">	 */</span></span><br><span class="line">	<span class="comment">// @RequestMapping(value = "/login", method = RequestMethod.POST)</span></span><br><span class="line">	<span class="meta">@PostMapping</span>(value = <span class="string">"/login"</span>)</span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">login</span><span class="params">(User user, Model model, HttpSession session)</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">		<span class="comment">// 获取用户名及密码</span></span><br><span class="line">		String username = user.getName();</span><br><span class="line">		String password = user.getPassword();</span><br><span class="line"></span><br><span class="line">		<span class="comment">// 此处模拟从数据库中获取用户名和密码后进行判断</span></span><br><span class="line">		<span class="keyword">if</span> ((username != <span class="keyword">null</span> &amp;&amp; username.equals(<span class="string">"YUbuntu0109"</span>)) &amp;&amp; (password != <span class="keyword">null</span> &amp;&amp; password.equals(<span class="string">"demo"</span>))) &#123;</span><br><span class="line">			<span class="comment">// 将用户对象添加到Sessoin</span></span><br><span class="line">			session.setAttribute(<span class="string">"USER_SESSION"</span>, user);</span><br><span class="line">			<span class="comment">// 重定向到主页面</span></span><br><span class="line">			<span class="keyword">return</span> <span class="string">"redirect:main"</span>;</span><br><span class="line"></span><br><span class="line">		&#125;</span><br><span class="line">		model.addAttribute(<span class="string">"msg"</span>, <span class="string">"用户名或密码错误,请重新登录哟 !"</span>);</span><br><span class="line"></span><br><span class="line">		<span class="keyword">return</span> <span class="string">"login"</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">/**</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Title</span>: toMain</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Description</span>: 跳转到用户主页</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@param</span>: null</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@return</span>: String</span></span><br><span class="line"><span class="comment">	 */</span></span><br><span class="line">	<span class="meta">@RequestMapping</span>(value = <span class="string">"/main"</span>)</span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">toMain</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> <span class="string">"main"</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">/**</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Title</span>: logout</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@Description</span>: 退出登录</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@param</span>: session</span></span><br><span class="line"><span class="comment">	 * <span class="doctag">@return</span>: String</span></span><br><span class="line"><span class="comment">	 */</span></span><br><span class="line">	<span class="meta">@RequestMapping</span>(value = <span class="string">"/logout"</span>)</span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">logout</span><span class="params">(HttpSession session)</span> </span>&#123;</span><br><span class="line">		<span class="comment">// 清除Session</span></span><br><span class="line">		session.invalidate();</span><br><span class="line">		<span class="comment">// 重定向到登录页面</span></span><br><span class="line">		<span class="keyword">return</span> <span class="string">"redirect:login"</span>;</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>LoginInterceptor.java : 自定义拦截器</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.springmvc.filter.interceptor;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletRequest;</span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletResponse;</span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpSession;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.web.servlet.HandlerInterceptor;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.servlet.ModelAndView;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> pers.huangyuhui.springmvc.filter.bean.User;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: MyInterceptor</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 用户登录拦截器</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 24, 2019 8:59:20 AM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">LoginInterceptor</span> <span class="keyword">implements</span> <span class="title">HandlerInterceptor</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">preHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line"></span><br><span class="line">		<span class="comment">// 获取请求的URL</span></span><br><span class="line">		String url = request.getRequestURI();</span><br><span class="line">		<span class="comment">// 除了login.jsp可以公开访问外,其它URL都进行拦截控制</span></span><br><span class="line">		<span class="keyword">if</span> (url.indexOf(<span class="string">"/login"</span>) &gt;= <span class="number">0</span>) &#123;</span><br><span class="line">			<span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="comment">// 获取Session</span></span><br><span class="line">		HttpSession session = request.getSession();</span><br><span class="line">		User user = (User) session.getAttribute(<span class="string">"USER_SESSION"</span>);</span><br><span class="line">		<span class="comment">// 判断Session中是否有用户数据</span></span><br><span class="line">		<span class="keyword">if</span> (user != <span class="keyword">null</span>) &#123;</span><br><span class="line">			<span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="comment">// 对不符合条件的给出提示信息并转发到登录页面</span></span><br><span class="line">		request.setAttribute(<span class="string">"msg"</span>, <span class="string">"你尚未登录,请先登录哟 !"</span>);</span><br><span class="line">		request.getRequestDispatcher(<span class="string">"/WEB-INF/view/login.jsp"</span>).forward(request, response);</span><br><span class="line"></span><br><span class="line">		<span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">postHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler,</span></span></span><br><span class="line"><span class="function"><span class="params">			ModelAndView modelAndView)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"this is postHandle"</span>);</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterCompletion</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"this is afterCompletion"</span>);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>将项目发布到Tomcat服务器并启动,在浏览器中访问地址: <code>http://localhost:8080/springmvc_filter/main</code> 其页面如下:</em></p>
</li>
</ol>
<p><img src="/2019/05/23/Spring-MVC之拦截器/SpringMVC_Filter-login.PNG" alt=" "></p>
<p><em>登录成功后,其页面如下 :</em></p>
<figure class="image-bubble">
                <div class="img-lightbox">
                    <div class="overlay"></div>
                    <img src="/2019/05/23/Spring-MVC之拦截器/SpringMVC_Filter-main.PNG" alt title>
                </div>
                <div class="image-caption"></div>
            </figure>

        </div>

        <blockquote class="post-copyright">
    
    <div class="content">
        
<span class="post-time">
    Last updated: <time datetime="2020-03-31T12:36:02.561Z" itemprop="dateUpdated">2020-03-31 12:36:02</time>
</span><br>


        
    </div>
    
    <footer>
        <a href="https://yubuntu0109.github.io">
            <img src="/img/my-portrait.jpg" alt="黄宇辉">
            黄宇辉
        </a>
    </footer>
</blockquote>

        
<div class="page-reward">
    <a id="rewardBtn" href="javascript:;" class="page-reward-btn waves-effect waves-circle waves-light">赏</a>
</div>



        <div class="post-footer">
            
	<ul class="article-tag-list"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/Spring-MVC/">Spring MVC</a></li></ul>


            
<div class="page-share-wrap">
    

<div class="page-share" id="pageShare">
    <ul class="reset share-icons">
      <li>
        <a class="weibo share-sns" target="_blank" href="http://service.weibo.com/share/share.php?url=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/&title=《Spring MVC之拦截器》 — 欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~&pic=https://yubuntu0109.github.io/img/my-portrait.jpg" data-title="微博">
          <i class="icon icon-weibo"></i>
        </a>
      </li>
      <li>
        <a class="weixin share-sns wxFab" href="javascript:;" data-title="微信">
          <i class="icon icon-weixin"></i>
        </a>
      </li>
      <li>
        <a class="qq share-sns" target="_blank" href="http://connect.qq.com/widget/shareqq/index.html?url=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/&title=《Spring MVC之拦截器》 — 欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~&source=My Personal Website For Blog" data-title=" QQ">
          <i class="icon icon-qq"></i>
        </a>
      </li>
      <li>
        <a class="facebook share-sns" target="_blank" href="https://www.facebook.com/sharer/sharer.php?u=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/" data-title=" Facebook">
          <i class="icon icon-facebook"></i>
        </a>
      </li>
      <li>
        <a class="twitter share-sns" target="_blank" href="https://twitter.com/intent/tweet?text=《Spring MVC之拦截器》 — 欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~&url=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/&via=https://yubuntu0109.github.io" data-title=" Twitter">
          <i class="icon icon-twitter"></i>
        </a>
      </li>
      <li>
        <a class="google share-sns" target="_blank" href="https://plus.google.com/share?url=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/" data-title=" Google+">
          <i class="icon icon-google-plus"></i>
        </a>
      </li>
    </ul>
 </div>



    <a href="javascript:;" id="shareFab" class="page-share-fab waves-effect waves-circle">
        <i class="icon icon-share-alt icon-lg"></i>
    </a>
</div>



        </div>
    </div>

    
<nav class="post-nav flex-row flex-justify-between">
  
    <div class="waves-block waves-effect prev">
      <a href="/2019/05/23/SSM框架整合/" id="post-prev" class="post-nav-link">
        <div class="tips"><i class="icon icon-angle-left icon-lg icon-pr"></i> Prev</div>
        <h4 class="title">SSM框架整合</h4>
      </a>
    </div>
  

  
    <div class="waves-block waves-effect next">
      <a href="/2019/05/22/Spring-MVC之数据绑定/" id="post-next" class="post-nav-link">
        <div class="tips">Next <i class="icon icon-angle-right icon-lg icon-pl"></i></div>
        <h4 class="title">Spring MVC之数据绑定</h4>
      </a>
    </div>
  
</nav>



    




















</article>

<div id="reward" class="page-modal reward-lay">
    <a class="close" href="javascript:;"><i class="icon icon-close"></i></a>
    <h3 class="reward-title">
        <i class="icon icon-quote-left"></i>
        thanks ~
        <i class="icon icon-quote-right"></i>
    </h3>
    <div class="reward-content">
        
        <div class="reward-code">
            <img id="rewardCode" src="/img/Wechat_appreciates.png" alt="打赏二维码">
        </div>
        
    </div>
</div>



</div>

        <footer class="footer">
    <div class="top">
        

        <p>
            
                <span><a href="/atom.xml" target="_blank" class="rss" title="rss"><i class="icon icon-lg icon-rss"></i></a></span>
            
            <span>This blog is licensed under a <a rel="license" href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>.</span>
        </p>
    </div>
    <div class="bottom">
        <!-- 统计网站用户访问量. 技术支持：不蒜子(http://busuanzi.ibruce.info/) ————> Mar 13,2019 -->
        <p>
            <font style='font-size: 12px;color:springgreen'>
                    <div align="center">
                        <!-- 安装脚本 -->
                        <script async src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script>
                        <!-- 安装标签 -->
                        <span id="busuanzi_container_site_pv">
                            ◎用户总访问量 : <span id="busuanzi_value_site_pv"></span> 次 ~ &nbsp&nbsp
                        </span>
                        <span id="busuanzi_container_site_uv">
                            ◎总访客数(（づ￣3￣）づ╭❤～) : <span id="busuanzi_value_site_uv"></span>人 ~
                        </span>
                    </div>
                </font>
            </p>
            <!---------->
            <p>
                <font style='font-size: 10px'>
                    <span>黄宇辉 &copy; 2019 - 2020</span>
                    <span>
                        
                        Blog source <a href="https://github.com/YUbuntu0109/YUbuntu0109.github.io" target="_blank">Github</a> 
                        Power by <a href="http://hexo.io/" target="_blank">Hexo</a>
                        Theme <a href="https://github.com/yscoder/hexo-theme-indigo" target="_blank">indigo</a>
                    </span>
                </font>
            </p>
        </div>
    </footer>
    </main>
    <div class="mask" id="mask"></div>
<a href="javascript:;" id="gotop" class="waves-effect waves-circle waves-light"><span class="icon icon-lg icon-chevron-up"></span></a>



<div class="global-share" id="globalShare">
    <ul class="reset share-icons">
      <li>
        <a class="weibo share-sns" target="_blank" href="http://service.weibo.com/share/share.php?url=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/&title=《Spring MVC之拦截器》 — 欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~&pic=https://yubuntu0109.github.io/img/my-portrait.jpg" data-title="微博">
          <i class="icon icon-weibo"></i>
        </a>
      </li>
      <li>
        <a class="weixin share-sns wxFab" href="javascript:;" data-title="微信">
          <i class="icon icon-weixin"></i>
        </a>
      </li>
      <li>
        <a class="qq share-sns" target="_blank" href="http://connect.qq.com/widget/shareqq/index.html?url=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/&title=《Spring MVC之拦截器》 — 欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~&source=My Personal Website For Blog" data-title=" QQ">
          <i class="icon icon-qq"></i>
        </a>
      </li>
      <li>
        <a class="facebook share-sns" target="_blank" href="https://www.facebook.com/sharer/sharer.php?u=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/" data-title=" Facebook">
          <i class="icon icon-facebook"></i>
        </a>
      </li>
      <li>
        <a class="twitter share-sns" target="_blank" href="https://twitter.com/intent/tweet?text=《Spring MVC之拦截器》 — 欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~&url=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/&via=https://yubuntu0109.github.io" data-title=" Twitter">
          <i class="icon icon-twitter"></i>
        </a>
      </li>
      <li>
        <a class="google share-sns" target="_blank" href="https://plus.google.com/share?url=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/" data-title=" Google+">
          <i class="icon icon-google-plus"></i>
        </a>
      </li>
    </ul>
 </div>


<div class="page-modal wx-share" id="wxShare">
    <a class="close" href="javascript:;"><i class="icon icon-close"></i></a>
    <p>扫一扫，分享到微信</p>
    <img src="//api.qrserver.com/v1/create-qr-code/?data=https://yubuntu0109.github.io/2019/05/23/Spring-MVC之拦截器/" alt="微信分享二维码">
</div>




    <script src="//cdn.bootcss.com/node-waves/0.7.4/waves.min.js"></script>
<script>
var BLOG = { ROOT: '/', SHARE: true, REWARD: true };


</script>

<script src="//unpkg.com/hexo-theme-material-indigo@latest/js/main.min.js"></script>


<div class="search-panel" id="search-panel">
    <ul class="search-result" id="search-result"></ul>
</div>
<template id="search-tpl">
<li class="item">
    <a href="{path}" class="waves-block waves-effect">
        <div class="title ellipsis" title="{title}">{title}</div>
        <div class="flex-row flex-middle">
            <div class="tags ellipsis">
                {tags}
            </div>
            <time class="flex-col time">{date}</time>
        </div>
    </a>
</li>
</template>

<script src="//unpkg.com/hexo-theme-material-indigo@latest/js/search.min.js" async></script>








<script>
(function() {
    var OriginTitile = document.title, titleTime;
    document.addEventListener('visibilitychange', function() {
        if (document.hidden) {
            document.title = 'Where are you going ?';
            clearTimeout(titleTime);
        } else {
            document.title = 'As long as you love me ~';
            titleTime = setTimeout(function() {
                document.title = OriginTitile;
            },2000);
        }
    });
})();
</script>



</body>
</html>
